Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-Sen University, Guangzhou 510006, China.
State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Environ Sci Technol. 2021 Jul 20;55(14):9579-9590. doi: 10.1021/acs.est.1c01095. Epub 2021 Apr 14.
Surface sediments of polluted urban rivers can be a reservoir of hydrophobic persistent organic pollutants (POPs). In this study, we comprehensively assessed the contamination of two groups of POPs, that is, polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs), in 173 black-odorous urban rivers in China. Spatial distribution of PCBs and PBDEs showed similar patterns but very different contamination levels in surface sediments, that is, average concentrations of 10.73 and 401.16 ng/g dw for the ∑PCBs and ∑PBDEs, respectively. -/-CBs and -BDE are major PCBs and PBDEs and accounted for 59.11 and 95.11 wt % of the ∑PCBs and ∑PBDEs, respectively. Compared with the persistence of PBDEs, the EF changes of chiral PCBs together with previous cultivation evidence indicated indigenous bioconversion of PCBs in black-odorous urban rivers, particularly the involvement of uncharacterized Dehalococcoidia in PCB dechlorination. Major PCB sources (and their relative contributions) included pigment/painting (25.36%), e-waste (22.92%), metallurgical industry (13.25%), and e-waste/biological degradation process (10.95%). A risk assessment indicated that exposure of resident organisms in urban river sediments to -/-BDEs could pose a high ecological risk. This study provides the first insight into the contamination, conversion and ecological risk of PCBs and PBDEs in nationwide polluted urban rivers in China.
受污染城市河流的表层沉积物可能是疏水性持久性有机污染物（POPs）的储存库。在本研究中，我们综合评估了两组 POPs，即多氯联苯（PCBs）和多溴二苯醚（PBDEs）在中国 173 条黑臭城市河流中的污染情况。PCBs 和 PBDEs 的空间分布呈现出相似的模式，但在表层沉积物中的污染水平却非常不同，即∑PCBs 和∑PBDEs 的平均浓度分别为 10.73 和 401.16ng/g dw。-/-CBs 和 -BDE 是主要的 PCBs 和 PBDEs，分别占∑PCBs 和∑PBDEs 的 59.11%和 95.11%wt%。与 PBDEs 的持久性相比，手性 PCBs 的 EF 变化以及以前的培养证据表明，黑臭城市河流中 PCBs 的本土生物转化，特别是未表征的脱卤球菌在 PCB 脱氯中的参与。主要 PCB 来源（及其相对贡献）包括颜料/绘画（25.36%）、电子废物（22.92%）、冶金工业（13.25%）和电子废物/生物降解过程（10.95%）。风险评估表明，城市河流沉积物中居民生物暴露于 -/-BDEs 可能会造成高生态风险。本研究首次深入了解了中国全国受污染城市河流中 PCBs 和 PBDEs 的污染、转化和生态风险。
